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//! Unix socket protocol for daemon ↔ CLI.
//!
//! Simple line-oriented text protocol:
//! PUT <ttl_secs> <content>\n
//! PUTP <ttl_secs> <content>\n
//! GET <key>\n
//! DEL <key>\n
//! PIN <key>\n
//! UNPIN <key>\n
//! STATUS\n
//! SHUTDOWN\n
//!
//! Responses:
//! OK <data>\n
//! ERR <message>\n
/// A parsed request received from the CLI over the Unix socket.
pub enum Request {
Put {
ttl_secs: u64,
content_b58: String,
encrypt: bool,
},
Get {
key: String,
},
Del {
key: String,
},
Pin {
key: String,
},
Unpin {
key: String,
},
Status,
Shutdown,
}
/// A response sent back to the CLI over the Unix socket.
pub enum Response {
Ok(String),
Err(String),
}
/// Parse a single protocol line into a [`Request`].
pub fn parse_request(line: &str) -> Result<Request, String> {
let line = line.trim();
if line.is_empty() {
return Err("empty request".into());
}
let mut parts = line.splitn(3, ' ');
let cmd = parts.next().unwrap();
match cmd {
"PUT" | "PUTP" => {
let ttl_str =
parts.next().ok_or("PUT requires: PUT <ttl> <data>")?;
let content_b58 =
parts.next().ok_or("PUT requires: PUT <ttl> <data>")?;
let ttl_secs: u64 =
ttl_str.parse().map_err(|_| "invalid TTL number")?;
Ok(Request::Put {
ttl_secs,
content_b58: content_b58.to_string(),
encrypt: cmd == "PUT",
})
}
"GET" => {
let key = parts.next().ok_or("GET requires: GET <key>")?;
Ok(Request::Get {
key: key.to_string(),
})
}
"DEL" => {
let key = parts.next().ok_or("DEL requires: DEL <key>")?;
Ok(Request::Del {
key: key.to_string(),
})
}
"PIN" => {
let key = parts.next().ok_or("PIN requires: PIN <key>")?;
Ok(Request::Pin {
key: key.to_string(),
})
}
"UNPIN" => {
let key = parts.next().ok_or("UNPIN requires: UNPIN <key>")?;
Ok(Request::Unpin {
key: key.to_string(),
})
}
"STATUS" => Ok(Request::Status),
"SHUTDOWN" => Ok(Request::Shutdown),
_ => Err(format!("unknown command: {cmd}")),
}
}
/// Serialize a [`Response`] into a protocol line (`OK ...\n` or `ERR ...\n`).
pub fn format_response(r: &Response) -> String {
match r {
Response::Ok(data) => format!("OK {data}\n"),
Response::Err(msg) => format!("ERR {msg}\n"),
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn parse_put() {
let r = parse_request("PUT 3600 deadbeef").unwrap();
match r {
Request::Put {
ttl_secs,
content_b58,
encrypt,
} => {
assert_eq!(ttl_secs, 3600);
assert_eq!(content_b58, "deadbeef");
assert!(encrypt);
}
_ => panic!("expected Put"),
}
}
#[test]
fn parse_putp() {
let r = parse_request("PUTP 60 abc").unwrap();
match r {
Request::Put { encrypt, .. } => assert!(!encrypt),
_ => panic!("expected Put"),
}
}
#[test]
fn parse_get() {
let r = parse_request("GET abc123#key456").unwrap();
match r {
Request::Get { key } => assert_eq!(key, "abc123#key456"),
_ => panic!("expected Get"),
}
}
#[test]
fn parse_status() {
assert!(matches!(parse_request("STATUS").unwrap(), Request::Status));
}
#[test]
fn parse_empty_fails() {
assert!(parse_request("").is_err());
}
#[test]
fn parse_unknown_fails() {
assert!(parse_request("FOOBAR").is_err());
}
#[test]
fn format_ok() {
let r = format_response(&Response::Ok("hello".into()));
assert_eq!(r, "OK hello\n");
}
#[test]
fn format_err() {
let r = format_response(&Response::Err("oops".into()));
assert_eq!(r, "ERR oops\n");
}
}
|